64 Valiant Fuel Problems, PLEASE HELP

I am having a similar problem with my 64 Valiant. If the car sits for a few days, it will not pull fuel from the tank, on the starter. Tried using a electric pump, and pumping into a container. There was not a lot of flow, and the fuel had a lot of "bubbles". I disconnected the steel line at the tank, and put a rubber cap on the line. Then used the "MityVac at the other end of the steel line (inlet of the pump). I could not pull a vacuum. I am assuming I have a pin hole in the steel line. I am waiting for the 5/16 NiCopp line to get here on Monday. Going to replace the complete fuel line.
PS: When replaceing the rubber hoses, use the hose for fuel injection. I think it is R9, not the old R7 type for carbs. It is much more tolerant of ethanol fuels.